SELECT 
  cscart_products.* 
FROM 
  cscart_products 
WHERE 
  cscart_products.product_id IN (
    12928, 12921, 12929, 12910, 12911, 12915, 
    12919, 12931, 12932, 12933, 12934, 
    12935, 12936, 12937, 12938, 12939, 
    12940, 12941, 12942, 13031
  )

Query time 0.00062

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": 20,
      "filtered": 100,
      "index_condition": "cscart_products.product_id in (12928,12921,12929,12910,12911,12915,12919,12931,12932,12933,12934,12935,12936,12937,12938,12939,12940,12941,12942,13031)"
    }
  }
}