CREATE TABLE IF NOT EXISTS `table` (
  `name` varchar(11) NOT NULL,
  `price` varchar(11) NOT NULL,
  `dt` datetime NOT NULL
) ENGINE=MyISAM DEFAULT CHARSET=utf8;

INSERT INTO `table` (`name`, `price`, `dt`) VALUES
('tampo', '6', '2017-09-26 15:50:00'),
('tampo', '7', '2017-09-26 15:51:00'),
('tampo', '4', '2017-09-26 15:52:00'),
('tampo', '5', '2017-09-26 15:53:00'),
('tampo', '1', '2017-09-26 15:54:00');

SELECT * FROM table
ORDER BY `price` DESC, `dt` ASC