Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c607bf827c3fa100ffa48dc5573158a12b67ced8efe0a0c032b25edd11983b8' 
  AND token = 'VhjrtsJfcqe46Ci4qO7v1TJEnMEeIFyldO+KZLcXUOI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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