SELECT 
  cscart_products.* 
FROM 
  cscart_products 
WHERE 
  cscart_products.product_id IN (
    2341, 15088, 15052, 15053, 15054, 15055, 
    15087, 15056, 15050, 15049, 15048, 
    15047, 11134, 2816, 2815, 13609, 13514, 
    2214, 15387, 2451, 2453, 2162, 12741, 
    11785
  )

Query time 0.00078

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "table_name": "cscart_products",
      "access_type": "range",
      "possible_keys": ["PRIMARY"],
      "key": "PRIMARY",
      "key_length": "3",
      "used_key_parts": ["product_id"],
      "rows": 24,
      "filtered": 100,
      "index_condition": "cscart_products.product_id in (2341,15088,15052,15053,15054,15055,15087,15056,15050,15049,15048,15047,11134,2816,2815,13609,13514,2214,15387,2451,2453,2162,12741,11785)"
    }
  }
}