Checks whether the library has the authentication and that is not expired
        :return: True if authenticated, False otherwise

def is_authenticated(self):
        """
        Checks whether the library has the authentication and that is not expired
        :return: True if authenticated, False otherwise
        """
        token = self.con.token_backend.token
        if not token:
            token = self.con.token_backend.get_token()

        return token is not None and not token.is_expired