Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab0a60d1972d5a20fa3fe8b0fc1453c84e817bde3e3525bfd421fd7b5172a7a9' 
  AND token = '4UA36YJ3f408dLZ5XibbbNw3wQlW7D8VzwiRMh3HqIU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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