SELECT 
  * 
FROM 
  cscart_wk_support_agents 
  LEFT JOIN cscart_wk_support_agents_descriptions ON cscart_wk_support_agents_descriptions.id = cscart_wk_support_agents.id 
WHERE 
  1 
  AND cscart_wk_support_agents_descriptions.lang_code = 'en' 
  AND cscart_wk_support_agents.status = 'A' 
ORDER BY 
  cscart_wk_support_agents.id asc

Query time 0.00016

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "table_name": "cscart_wk_support_agents_descriptions",
      "access_type": "system",
      "possible_keys": ["PRIMARY", "id"],
      "rows": 1,
      "filtered": 100
    },
    "table": {
      "table_name": "cscart_wk_support_agents",
      "access_type": "const",
      "possible_keys": ["PRIMARY"],
      "key": "PRIMARY",
      "key_length": "4",
      "used_key_parts": ["id"],
      "ref": ["const"],
      "rows": 1,
      "filtered": 100
    }
  }
}