SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9759476b81ae6daa34434218495f207b52d7032a6c925a6334869cc93ee9bdb8' 
  AND token = 'mewdwNAyyj0avr/SdtTWXx+WtIhZFcre64+pl3CeOb4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

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