SELECT 
  product_id 
FROM 
  cscart_mb_ali_products 
WHERE 
  product_id IN (
    20989, 20990, 20991, 20992, 20993, 20994, 
    20995, 20996, 20997, 20998, 20999, 
    21000, 21001, 21002, 21003, 21004
  )

Query time 0.00016

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "table_name": "cscart_mb_ali_products",
      "access_type": "range",
      "possible_keys": ["product_id"],
      "key": "product_id",
      "key_length": "4",
      "used_key_parts": ["product_id"],
      "rows": 16,
      "filtered": 100,
      "attached_condition": "cscart_mb_ali_products.product_id in (20989,20990,20991,20992,20993,20994,20995,20996,20997,20998,20999,21000,21001,21002,21003,21004)",
      "using_index": true
    }
  }
}