SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '89d187e702388c22f009c8063476dad279121f90a9a101d675e88ffdf6248518' 
  AND token = '+ozoeZvrs2CVD5bAhOrRqQkiGYuNSltFvJzbHA6Nq4g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00780

JSON explain

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