SELECT 
  cscart_products.* 
FROM 
  cscart_products 
WHERE 
  cscart_products.product_id IN (
    8359, 8134, 8297, 8454, 18016, 7635, 
    7577, 7643, 7621, 7157, 7158, 8064, 
    8295, 7592, 7926, 7180, 8158, 8383, 
    7613, 8296, 8577, 7152, 18015, 8938
  )

Query time 0.00106

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 (8359,8134,8297,8454,18016,7635,7577,7643,7621,7157,7158,8064,8295,7592,7926,7180,8158,8383,7613,8296,8577,7152,18015,8938)"
    }
  }
}