SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f38d015de8fa8dd8917873b2596ad15e15a613556608a462bab19ec5c631e0e' 
  AND token = 'VsqzNUREMw8IxqivHva/b58mzSBHiZNc4VWHRtYwTN4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

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