mysql5.6.19下子查询为什么无法使用索引

CREATE TABLE `oplogs` (`id` int(10) unsigned NOT NULL AUTO_INCREMENT,`kind` varchar(45) NOT NULL DEFAULT '',`op` varchar(100) NOT NULL,`user` varchar(25) NOT NULL DEFAULT '',`ip` varchar(16) NOT NULL DEFAULT '',`updatetime` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,PRIMARY KEY (`id`)) ENGINE=MyISAM AUTO_INCREMENT=34896 DEFAULT CHARSET=utf8 ROW_FORMAT=FIXED

SELECT a.id,a.kind,a.op,a.user,a.ip,a.updatetime FROM oplogs as a inner join(select id from oplogs where 1 order by id desc limit 0,20) as b using(id)