Did you also run a rebuild index ?
Just defining is not enough.

If you use a custom class query %Library.Query type you may write your parameters to some
^mtemp.Evgeny($i(^mtermp.Egeny)) = ..... direct from the Execute method
or ^mtemp.Evgeny($h) = ....

For basic class query %SQL.Query () you may take the usual SQL approach

• Create a SQL method that always returns 1 (TRUE)
• You pass all your parameters into that method 
  • which does the ^mtemp trick and a QUIT 1
• add to the WHERE clause  . . .  AND MYTRACE(par1,par2,---)=1

I refer to this a STATIC clause since it is only executed once by query
because of no reference to any column values 

It was my approach to SQL debugging
 

If your payload is received as a string 

set jsn={}.%FromJSON(payload)
write jsn.%Get("boolprop")

works without a persistent object