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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7309e01e9b86cefe80276c1c617b38babc19e88b83e4d00f609c118a30dd73fb' 
  AND token = '/9eD41mD7I/jOx5zLxJnoKWCK8QBDNDN4Ffgg47zDio=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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