SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '796cca23ce2b5680b703e915bec3f78ecbb458aa9799a2ca648078619e4341fd' 
  AND token = 'qV0PXE43alGIB+60/hRcdXOXd4kDeajQ44S9AoguBs8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

Explain
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE Impossible WHERE noticed after reading const tables