SELECT 
  cscart_products.* 
FROM 
  cscart_products 
WHERE 
  cscart_products.product_id IN (
    10776, 10777, 12944, 12985, 12986, 12987, 
    12988, 12989, 12990, 12991, 12992, 
    12993, 12994, 10063, 10052, 10072, 
    10046, 10059, 10064, 10057
  )

Query time 0.00045

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 (10776,10777,12944,12985,12986,12987,12988,12989,12990,12991,12992,12993,12994,10063,10052,10072,10046,10059,10064,10057)"
    }
  }
}