SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '735fc1660775e04a7fc45c2e1c164611de51f2c16078a8e9bc37b3a1c3c6e615' 
  AND token = 'vXZJQ7zPlREftaWZLm+lzqPdHw2cpPuuuqenn2WomqQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

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