SELECT 
  products.company_id as variant_id, 
  company_descr.i18n_company as variant 
FROM 
  cscart_products as products 
  LEFT JOIN cscart_company_descriptions as company_descr ON company_descr.company_id = products.company_id 
  AND company_descr.lang_code = 'en' 
  LEFT JOIN cscart_companies AS companies ON companies.company_id = products.company_id 
  INNER JOIN cscart_products_categories as products_categories ON products_categories.product_id = products.product_id 
  INNER JOIN cscart_categories ON cscart_categories.category_id = products_categories.category_id 
  AND (
    cscart_categories.usergroup_ids = '' 
    OR FIND_IN_SET(
      0, cscart_categories.usergroup_ids
    ) 
    OR FIND_IN_SET(
      1, cscart_categories.usergroup_ids
    )
  ) 
  AND cscart_categories.status IN ('A', 'H') 
  AND cscart_categories.storefront_id IN (0, 1) 
  LEFT JOIN cscart_warehouses_sum_products_amount as war_sum_amount ON war_sum_amount.product_id = products.product_id 
  LEFT JOIN cscart_product_prices AS opt_prices ON opt_prices.product_id = products.product_id 
  AND opt_prices.lower_limit > 1 
  AND opt_prices.usergroup_id IN (0, 1) 
  LEFT JOIN cscart_product_prices AS abt_normal_prices ON abt_normal_prices.product_id = products.product_id 
  AND abt_normal_prices.lower_limit = 1 
WHERE 
  1 = 1 
  AND cscart_categories.category_id IN (313, 509, 510, 511) 
  AND companies.status IN ('A') 
  AND (
    products.usergroup_ids = '' 
    OR FIND_IN_SET(0, products.usergroup_ids) 
    OR FIND_IN_SET(1, products.usergroup_ids)
  ) 
  AND products.status IN ('A') 
  AND products.product_type != 'D' 
GROUP BY 
  products.company_id 
ORDER BY 
  company_descr.i18n_company ASC

Query time 0.00156

JSON explain

{
  "query_block": {
    "select_id": 1,
    "filesort": {
      "sort_key": "company_descr.i18n_company",
      "temporary_table": {
        "table": {
          "table_name": "cscart_categories",
          "access_type": "range",
          "possible_keys": ["PRIMARY", "c_status", "p_category_id"],
          "key": "PRIMARY",
          "key_length": "3",
          "used_key_parts": ["category_id"],
          "rows": 4,
          "filtered": 100,
          "index_condition": "cscart_categories.category_id in (313,509,510,511)",
          "attached_condition": "(cscart_categories.usergroup_ids = '' or find_in_set(0,cscart_categories.usergroup_ids) or find_in_set(1,cscart_categories.usergroup_ids)) and cscart_categories.`status` in ('A','H') and cscart_categories.storefront_id in (0,1)"
        },
        "table": {
          "table_name": "products_categories",
          "access_type": "ref",
          "possible_keys": ["PRIMARY", "pt"],
          "key": "PRIMARY",
          "key_length": "3",
          "used_key_parts": ["category_id"],
          "ref": ["ymonline_livedata.cscart_categories.category_id"],
          "rows": 71,
          "filtered": 100,
          "using_index": true
        },
        "table": {
          "table_name": "products",
          "access_type": "eq_ref",
          "possible_keys": ["PRIMARY", "status"],
          "key": "PRIMARY",
          "key_length": "3",
          "used_key_parts": ["product_id"],
          "ref": ["ymonline_livedata.products_categories.product_id"],
          "rows": 1,
          "filtered": 60.81953049,
          "attached_condition": "(products.usergroup_ids = '' or find_in_set(0,products.usergroup_ids) or find_in_set(1,products.usergroup_ids)) and products.`status` = 'A' and products.product_type <> 'D'"
        },
        "table": {
          "table_name": "company_descr",
          "access_type": "eq_ref",
          "possible_keys": ["PRIMARY"],
          "key": "PRIMARY",
          "key_length": "10",
          "used_key_parts": ["company_id", "lang_code"],
          "ref": ["ymonline_livedata.products.company_id", "const"],
          "rows": 1,
          "filtered": 100,
          "attached_condition": "trigcond(company_descr.lang_code = 'en')"
        },
        "table": {
          "table_name": "companies",
          "access_type": "eq_ref",
          "possible_keys": ["PRIMARY"],
          "key": "PRIMARY",
          "key_length": "4",
          "used_key_parts": ["company_id"],
          "ref": ["ymonline_livedata.products.company_id"],
          "rows": 1,
          "filtered": 100,
          "attached_condition": "companies.`status` = 'A'"
        },
        "table": {
          "table_name": "war_sum_amount",
          "access_type": "ref",
          "possible_keys": ["PRIMARY"],
          "key": "PRIMARY",
          "key_length": "3",
          "used_key_parts": ["product_id"],
          "ref": ["ymonline_livedata.products_categories.product_id"],
          "rows": 19,
          "filtered": 100,
          "using_index": true
        },
        "table": {
          "table_name": "opt_prices",
          "access_type": "ref",
          "possible_keys": [
            "usergroup",
            "product_id",
            "lower_limit",
            "usergroup_id"
          ],
          "key": "usergroup",
          "key_length": "3",
          "used_key_parts": ["product_id"],
          "ref": ["ymonline_livedata.products_categories.product_id"],
          "rows": 67,
          "filtered": 3.174609423,
          "attached_condition": "trigcond(opt_prices.lower_limit > 1 and opt_prices.usergroup_id in (0,1))",
          "using_index": true
        },
        "table": {
          "table_name": "abt_normal_prices",
          "access_type": "ref",
          "possible_keys": ["usergroup", "product_id", "lower_limit"],
          "key": "usergroup",
          "key_length": "3",
          "used_key_parts": ["product_id"],
          "ref": ["ymonline_livedata.products_categories.product_id"],
          "rows": 67,
          "filtered": 95.75352478,
          "attached_condition": "trigcond(abt_normal_prices.lower_limit = 1)",
          "using_index": true
        }
      }
    }
  }
}