Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74192986ea5e929ef1221084494f87bbb6ef91303fb9acf70415c15aa2421079' 
  AND token = 'yY5Iu7EZusYnu3tu1/aOv5UDiqHoZ+GpSuobQ8nRPdw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}