space and time are joined. i.e. travel at the speed of light time will stand still to the outside observer, so you could travel an infinite distance, what would happen is that as you reach the speed of light you would be at your destination.
however, it would have taken you millions of years. hence its not practical (even if you could travel at light speed).
to have the star trek style travel you would need to bend time and space.
for example, to reach a place 100 light years away you would need to 1) reach the speed of light, 2) travel 100 years in the past. at the same time. then you would move instantly to that place and be in the correct time.
that is a simple explanation but what im trying to say, if they make faster than light travel, it will involve a manipulation of time