Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a027c520a224b5f304ba34bf116efe3358fa03ec404dbb965b42c0043593bd89' 
  AND token = 'prijNIYXQEP4FjSPGxftBVi7x8iFcwEw7dGHtn/9+sA=' 
  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"
    }
  }
}