SELECT 
  cscart_products.* 
FROM 
  cscart_products 
WHERE 
  cscart_products.product_id IN (
    49230, 35730, 37315, 3579, 1402, 23267, 
    3859, 225, 3611, 37413, 32324, 27934, 
    49324, 49281
  )

Query time 0.00173

JSON explain

{
  "query_block": {
    "select_id": 1,
    "nested_loop": [
      {
        "table": {
          "table_name": "cscart_products",
          "access_type": "range",
          "possible_keys": ["PRIMARY"],
          "key": "PRIMARY",
          "key_length": "3",
          "used_key_parts": ["product_id"],
          "rows": 14,
          "filtered": 100,
          "index_condition": "cscart_products.product_id in (49230,35730,37315,3579,1402,23267,3859,225,3611,37413,32324,27934,49324,49281)"
        }
      }
    ]
  }
}