Sandbox

SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '7fe4f1c9464be7ea2920c1d70eab4f3762cf8e9ec9f92e2b76010ca4a240b5f6' 
  AND token = '/49UJMEccTZ6lJxW0DkiZ8v//lwp+faBt+XpYsPRBoM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00753

JSON explain

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