SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '4ec7ad501d5c953f56a733bd7e058b68b9681592b69eb88bd1b9b43a9a1d57f5' 
  AND token = 'qXi/NnrgOpQGgpZrz6OswYKDz7v9y/rnrxMGEadphN4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00764

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}