Author's Publish for this week offers 30 magazine markets taking Flash and, in odd cases, shorter fiction. Flash here seems to mean anything from 600 words for one pub to 1500 for some others (and that's the limit the article uses). Our familiar 1000 shows up a lot, too. Genres and themes are all over the map. I do like writing flash but obviously it isn't going to pay that well even if they pay per story rather than per word. Still, if you want try publishing professionally and prefer shorter lengths, here you go.
https://authorspublish.com/30-magazines-accepting-flash-fiction/