Well, maybe "ftl warp drive" wont exist irl, but thats no problem when it comes to exploring other stellar systems, the most viable way to reach the closest star within a life time would be the antimatter based drives. Antimatter production requires a lot of power and the magnetic confinement method of storing it is also power intensive, all of these just for it to decay very rapidly. If you manage to over come these problems, you have the most powerful drives ever created (more than chemical rockets) while being the most efficient (more than electromagnetic plasma drives)