SELECT 
  tmall_products.* 
FROM 
  tmall_products 
WHERE 
  tmall_products.product_id IN (
    97, 100, 101, 102, 103, 104, 105, 106, 
    107, 108, 109, 110, 111, 112, 113, 114, 
    115, 116, 117, 118
  )

Query time 0.00830

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 (97,100,101,102,103,104,105,106,107,108,109,110,111,112,113,114,115,116,117,118)"
        }
      }
    ]
  }
}