SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be2b53a78e6bbd24c3832ceb6486f127ba2f567d15006957394dbe92673a3c58' 
  AND token = '2O4Xx/wulf2WsH9Qy/nJYUZbRgCLpYgWYsaXIHj7qqU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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