Guess you have to turn it into a positive. "I was fired for being late but that has certainly taught me a lesson. I have now made a really big change in my life to get organised to ensure it never happens again".
If you have other job experiences, just leave out this last job. If they are interested in hiring you, they might ask you what you've been up to lately. In that case, be honest. But don't deliberately mention it if you can; it's possible that they won't even consider hiring you because of your history of tardiness.
since you were there less than 90 days, you don't necessarily have to put it down. if you have to put it down and they are asking - why you left your last position, tell the truth.... scheduling conflicts.