SELECT 
  tmall_products.* 
FROM 
  tmall_products 
WHERE 
  tmall_products.product_id IN (
    94, 96, 114, 108, 121, 103, 95, 112, 89, 
    116, 82, 85, 88, 110, 93, 87, 118, 83, 
    123, 119
  )

Query time 0.00957

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost": 0.035335462,
    "nested_loop": [
      {
        "table": {
          "table_name": "tmall_products",
          "access_type": "range",
          "possible_keys": ["PRIMARY"],
          "key": "PRIMARY",
          "key_length": "3",
          "used_key_parts": ["product_id"],
          "loops": 1,
          "rows": 20,
          "cost": 0.035335462,
          "filtered": 100,
          "index_condition": "tmall_products.product_id in (94,96,114,108,121,103,95,112,89,116,82,85,88,110,93,87,118,83,123,119)"
        }
      }
    ]
  }
}