There is a System Roles query view that will allow you to query on users, groups and their synchronization status.

1. Go to Analysis > Information Library
2. Add a new Ad-hoc query
3. Scroll down the list of available query types and select System Roles

This query has a node for Users who are assigned to a role which contains a field for synchronized.
This query also contains a node for which Active Directory groups are synced with the System Roles.