You can, what you are looking for is specific impulse, ion engines are the ones with the highest impulse and over long periods of time they can get to massive speeds, but that is relative to earth.
When going somewhere in space you have to think not only where is your target but how its moving.
Also how are you going to brake. I f you wanted to go to the moon the fastest way possible you dont only have to think about how you accelerate but how you brake. Braking in space is more limiting than accelerating.
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