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That sounds really familiar. Unfortunately, the only possibilities I can think of are both more recent (Tutenstein and Cyber Chase).
Otherwise known as [Smashing Melons 42].
Based purely on the final paragraph, I'm going with Flying Rhino Junior High. Specifically, episode 4 seems to jibe with the rest of your description, going by TOW's summary. You can watch it for free on Youtube if you happen to be in Scotland, or 2 bucks in the US
(first 2 mins can be viewed free).
That's gotta be it, I've never heard of anything else like it and it fits the description perfectly IIRC. Thanks!
EDIT: Yeah, just watched it. Pity it's too obscure to find for free on some questionably legitimate site five pages into a Google search, but oh well. It's...it's really bad, but it's definitely the thing I remember seeing that one morning. Thanks again :P
Edited by ProgenyExMachina
I once saw this one episode of some animated show in a hotel room, and since then (about 10-12 years) I've wondered about it.
In the episode, some kids were on a class trip to an ancient Egypt museum. Four of them broke off from the group, and found a sarcophagus with a shiny golden thing on top of it, which they found out was called the "golden scarab"; one girl misheard it and thought it was "golden scab". When they were leaving the room, one of the characters heard a voice saying "I am the golden scarab. Take me." So he (I think it was one of the boys) did. Soon the group realized they were being chased by an evil mummy that came out of the sarcophagus after they had left the room, and when they found out that the kid had taken the golden scarab, they rushed to put it back before the mummy caught them. When they put it back, the mummy froze in place.
Just then, they realized that the sun was in some position (its peak?), which meant that the doors out of the museum were closing. They made a break for it and just barely made it through all the doors that were slamming down; the brainy girl character ended up using the book about the museum she'd been referring to the whole time to force the last door open just long enough for them to slide under it.
There was also a part somewhere along the line where the group found the rest of the class, and they were all in mummy gear, with the teacher saying something about joining them on the next step in their adventure.
At the very end, the scene went to a boy in some sort of control room, watching the whole thing on a screen, and he was annoyed that the kids escaped. Then the golden scarab fell through a door or something in the ceiling and hit him in the head, followed by enough sand to bury him (although I'm 50% sure he popped his head out afterward).
Edited by ProgenyExMachina