SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5482daccfb472c49e39420393bb7bb516d796d128d2baa3a5ab2fb4b30a82e70' 
  AND token = 'jg4zva79N+EFFvJILO40NJCCBslCVzC71RYCNXvudvE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

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