MySQL Workbench secretly running SHOW INDEX after every query
Scanning the source code of MySQL Workbench you can see a few places where SHOW INDEX is sent out. The application needs to run quite a number of queries for its tasks, e.g. the index view or the table editor. Some of them are only active when you open a view from the management section. Others, like the SQL editor need a SHOW INDEX to find info about PK columns which is needed to decide if a resultset returned for a query can be edited.