Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4c0721cfc517e0eb41b7901236ec34f6bba9cff594d600ad09c11c00b3eeeb0' 
  AND token = 'fesDrtnjfzHbHVRba7Y8na/uGP5Jog+KK0FLFMkEfwE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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