Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7d0f02b81f869cfb3bcbaabea17d31df4315d82237f340ab29356d012fd3bbb' 
  AND token = 'OpDvIgZ6b7z21ThpJdQcFJtRoe0crPTxqUrGlJjt0H4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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