Looks like whole SD flow you trying to fetch in single query 
First you check the database statistic of these table are upto date in system ( Check with basis team )
if this query was working fine earlier.
Most of table involved are huge volume tables which queried with any primary key
Any secondary index on created for LIKP on VSTEL WADET ?
My suggestion would be split the selection queries and make use of primary or existing secondary index to fetch the desired result if possible. For testing purpose split the queries and find which is taking more time and which needs index by taking squel trace in ST05.
Also take ST05 trace of this query in debugger ( New debugger -> special tool -> trace > ST05/SE30)