不使用EXPLAIN不能使用FORCE INDEX

Question

I'm working with MySQL Server version: 5.7.21.

I have a table with 2.804.806 rows, so it gets slow when I query through it without indexing.

I have a PRIMARY index on 'id' which is AUTO_INCREMENT.

My next step was to do modify my query like this :

SELECT id, ut_date, servo_on, running_on, arc_on, robot_id FROM process__status_timers USE INDEX (id) WHERE id >934173 AND ut_date > 1546297200000 ORDER BY robot_id , id ASC

But still it was not using my key so I used FORCE INDEX and finally i got :

But when I remove the EXPLAIN I get a syntax error:

SELECT id, ut_date, servo_on, running_on, arc_on, robot_id FROM process__status_timers FORCE INDEX (PRIMARY) WHERE id >934173 AND ut_date > 1546297200000 ORDER BY robot_id , id ASC ; 

1. Unrecognized keyword. (near FORCE)

2. Unrecognized keyword.(near INDEX)

3. Unexpected token (near ()

4. Unrecognized keyword.(near PRIMARY)

5. Unexpected token (near ()

what I'm doing wrong ?

Thanks in advance