SELECT 
  cscart_products.* 
FROM 
  cscart_products 
WHERE 
  cscart_products.product_id IN (
    13006, 13005, 13004, 13003, 13002, 13001, 
    13000, 12999, 10812, 10811, 10810, 
    10809, 10808, 10807, 10806, 10805, 
    10804, 10803, 10802, 10801
  )

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 (13006,13005,13004,13003,13002,13001,13000,12999,10812,10811,10810,10809,10808,10807,10806,10805,10804,10803,10802,10801)"
    }
  }
}