Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a66504985e60b64da6efc7114e5d601ccc00e16e119709a5311bb574b817bad' 
  AND token = 'tj0/P+l9OhFUjjHPBwem4vsu9ERLqiZ+OoKEBkTQ2jE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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