This key is required to access 
Troves of the Thunder King and is consumed when you enter the instance.
Key to the Palace of Lei Shen
- Key to the Palace of Lei Shen
- Item Level 1
- Binds when picked up
- "An ancient key to a secret entrance in the Thunder King's Citadel. The Shado-Pan would be interested in this."
This item is no longer available in game.
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Posted Apr 14, 2014 (Patch 6.0.1)You can only loot one of these per week from mobs. At a very low chance, it is possible to obtain more for that week from sources other than mobs.
Edit: Rendered unobtainable in Patch 6.0.2. The scenario itself was not removed, so you can still access it provided you have any keys remaining.
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Posted Jul 16, 2014 (Patch 6.0.1)Your information is clearly out of date, even for 5.4.2
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Posted Jul 16, 2014 (Patch 6.0.1)After checking various sources, my comment is still accurate as of Patch 5.4.8.
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Posted Jul 16, 2014 (Patch 6.0.1)Alayea's information is correct. See Bashiok's explanation. (For future reference, if you find a post with old information you can use the Report feature and select "Out of date" as the reason.)