SELECT 
  cscart_products.* 
FROM 
  cscart_products 
WHERE 
  cscart_products.product_id IN (
    65800, 65801, 65818, 65807, 65817, 65659, 
    65718, 65657, 65719, 65791, 65789, 
    65790
  )

Query time 0.00080

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": 12,
      "filtered": 100,
      "attached_condition": "cscart_products.product_id in (65800,65801,65818,65807,65817,65659,65718,65657,65719,65791,65789,65790)"
    }
  }
}

Result