SELECT 
  tmall_products.* 
FROM 
  tmall_products 
WHERE 
  tmall_products.product_id IN (
    12, 78, 79, 11, 41, 81, 107, 109, 91, 92, 
    34, 15, 31, 38, 80, 102, 28, 280, 282, 
    278
  )

Query time 0.00873

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 (12,78,79,11,41,81,107,109,91,92,34,15,31,38,80,102,28,280,282,278)"
        }
      }
    ]
  }
}