SELECT 
  product_id 
FROM 
  cscart_mb_ali_products 
WHERE 
  product_id IN (
    19901, 19902, 19903, 19904, 19905, 19906, 
    19907, 19908, 19909, 19910, 19911, 
    19912, 19913, 19914, 19915, 19916
  )

Query time 0.00014

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 (19901,19902,19903,19904,19905,19906,19907,19908,19909,19910,19911,19912,19913,19914,19915,19916)",
      "using_index": true
    }
  }
}