[mysql] FORCE INDEX in MySQL - where do I put it?

I have the following MySQL query that works perfectly fine. Except that I need to add a FORCE INDEX and I'm unsure on where I have to do this. I tried just about every location and always receive a MySQL error. What am I doing wrong?

Here is the original query:

$sql_select_recent_items = $db->query("SELECT * FROM (SELECT owner_id, product_id, start_time, price, currency, name, closed, active, approved, deleted, creation_in_progress FROM db_products ORDER BY start_time DESC) as resultstable
WHERE resultstable.closed=0 AND resultstable.active=1 AND resultstable.approved=1 AND resultstable.deleted=0 AND resultstable.creation_in_progress=0
GROUP BY resultstable.owner_id
ORDER BY start_time DESC");

The query is constructed this way so that I can do the ORDER BY before the GROUP BY, in case you're wondering.

What I need to add is:

FORCE INDEX (products_start_time)

I tried it just about everywhere without success, which leads me to believe that there's something more complex that I'm missing?

FORCE_INDEX is going to be deprecated after MySQL 8:

Thus, you should expect USE INDEX, FORCE INDEX, and IGNORE INDEX to be deprecated in 
a future release of MySQL, and at some time thereafter to be removed altogether.

https://dev.mysql.com/doc/refman/8.0/en/index-hints.html

You should be using JOIN_INDEX, GROUP_INDEX, ORDER_INDEX, and INDEX instead, for v8.