SELECT 
  cscart_products.* 
FROM 
  cscart_products 
WHERE 
  cscart_products.product_id IN (
    65451, 65433, 65472, 65811, 65448, 65434, 
    65806, 65800, 65801, 65818, 65807, 
    65452
  )

Query time 0.00090

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 (65451,65433,65472,65811,65448,65434,65806,65800,65801,65818,65807,65452)"
    }
  }
}

Result