I think I did that. I tried this thing earlier but for some reason if I set a character's level (not GM) to a level that is not 30-40 it does not show up, which is what I wanted. But then, if I set the level 30-40, then 40+ it still shows up. But then... I tried on GM account. In the end, I believe you just have to do the mission even you are higher than level 40 then it will not show up anymore regarding if you are level 41 or higher after completion.
I thought you can skip the mission if you ignore it and after you would have leveled up to 41 it would have disappeard by itself.
Does that make sense? Anyway, thanks for replying.