SELECT 
  cscart_products.* 
FROM 
  cscart_products 
WHERE 
  cscart_products.product_id IN (
    10808, 10809, 10810, 10811, 10812, 10827, 
    10828, 9839, 12702, 9841, 9848, 9840, 
    9844, 9843, 9846, 9845
  )

Query time 0.00073

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": 16,
      "filtered": 100,
      "index_condition": "cscart_products.product_id in (10808,10809,10810,10811,10812,10827,10828,9839,12702,9841,9848,9840,9844,9843,9846,9845)"
    }
  }
}