SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cebc7400be1c73a67b21230f3e40cb9ccf944b0bc6fca73cd834ef1bb089476b' 
  AND token = 'YwWnPrMahnkxxkn48/PmYvHhiT4hKeHr+NvSsmKUTT4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

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