SELECT 
  cscart_products.* 
FROM 
  cscart_products 
WHERE 
  cscart_products.product_id IN (
    10606, 10644, 10101, 10175, 10100, 15962, 
    15961, 15960, 15959, 10094, 10093, 
    9813, 10097, 9760, 9759, 9934, 9933, 
    9932, 9931, 9936
  )

Query time 0.00066

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": 20,
      "filtered": 100,
      "index_condition": "cscart_products.product_id in (10606,10644,10101,10175,10100,15962,15961,15960,15959,10094,10093,9813,10097,9760,9759,9934,9933,9932,9931,9936)"
    }
  }
}