How do I determine the cause of a very small table responding to queries slowly?
If multiple threads are issuing the delete/update/select statements concurrently, then blocking is the most likely explanation.
You could use SQL Profiler and filter the trace on TextData Like '%MYTABLE%' to find all the statements accessing the table. 

https://stackoverflow.com/questions/4076516/how-to-profile-for-one-table-in-sql-server

However use caution with SQL Profiler in a production environment, it can impact overall server performance.