SELECT 
  cscart_products.* 
FROM 
  cscart_products 
WHERE 
  cscart_products.product_id IN (
    489, 3654, 3655, 3664, 3657, 467, 3663, 
    491, 490, 459, 506, 468, 488, 6024, 505, 
    504, 492, 4978, 3739, 4979, 4981, 5916, 
    5921, 5917
  )

Query time 0.00048

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 (489,3654,3655,3664,3657,467,3663,491,490,459,506,468,488,6024,505,504,492,4978,3739,4979,4981,5916,5921,5917)"
    }
  }
}