SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38d43de37af1bd8c4313b98202fc7ef59f81bec7b0ee2e3568766e745f5743b6' 
  AND token = 'SiKEdaktE2xcG1t6iZRanBwOC2jqWIt+sXxLGsOdMbk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

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