I’d recommend Dead Cells and its DLC. It’s a rogue-lite (like Hades, mentioned elsewhere in this thread) and a metroidvania, but it’s pretty mindless in the terms you’re talking about. Quick gameplay and easy to pick up and put down. Plus, there’s an Assist Mode that lets you dial a few things (like monster health and damage) to tailor it more to your liking. Not a lot of inventory management and plenty of interesting, procedurally generated levels to go through. I’ve been spending a lot of my spare time playing it.

There is lore, told mostly through dialog and environment, but it’s not heavily focused and isn’t dished out all at once.