pg_locks-exclusivelock for select queries

Dear all,

I am running below query on a database. why is it creating a exclusive lock
on a virtualxid? I am running some SELECT queries and its creating an
ExclusiveLock in virtualxid? is this normal?

SELECT datname, pid, state, query, age(clock_timestamp(), query_start) AS
age

FROM pg_stat_activity

WHERE state <> 'idle'

--AND query NOT LIKE '% FROM pg_stat_activity %'

ORDER BY age;

|locktype
|database|relation|page|tuple|virtualxid|transactionid|classid|objid|objsubid|virtualtransaction|pid
|mode |granted|fastpath|waitstart|
|----------|--------|--------|----|-----|----------|-------------|-------|-----|--------|------------------|------|---------------|-------|--------|---------|
|relation |58,007 |12,073 | | | | | |
| |5/165 |21,912|AccessShareLock|true |true |
|
|virtualxid| | | | |5/165 | | |
| |5/165 |21,912|ExclusiveLock |true |true |
|

Thanks,
ACDBA