Sébastien Pi
I would say it was closed.
We can see it on the service station building years ago.
Now, it is not in their website anymore: https://minimarket.is/adresy-sklepow/

Sadly, I slept in the nearby camping and did go check. I saw the service station but did not pay attention to the building.

The note is not on the right location and the Mini market seems to be closed now, I will close it.