SELECT 
  cscart_products.* 
FROM 
  cscart_products 
WHERE 
  cscart_products.product_id IN (
    8475, 7193, 8789, 7557, 7194, 18114, 
    8014, 8013, 18115, 8476, 8477, 8478, 
    7198, 7197, 8479, 8480, 8481, 8482, 
    7199, 8483, 8484, 14004, 8501, 8851
  )

Query time 0.00126

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 (8475,7193,8789,7557,7194,18114,8014,8013,18115,8476,8477,8478,7198,7197,8479,8480,8481,8482,7199,8483,8484,14004,8501,8851)"
    }
  }
}