SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = 'c18b7925d868e0e6af761bc0c428a18ad14240339912f48cf5af5d8687a6ecdb' 
  AND token = '0A/w+4IwfVD380OhQxr6umq0VJUQnP2ejJTvUEDtzUw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.01206

JSON explain

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