This doesn’t look like it would produce meaningful SQL, keys cannot hold different values at the same time (that’s why JOINs are usually required in complex queries).
Also using $_GET global in queries is horribly insecure, if you have this anywhere near live site you should remove it immediately.
You earlier question used WP_Query, if it did work at all (even if slowly) you should start with studying SQL it produced and optimize from that point.