SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4710eaa1b4896756c37b7f5fc0b6583d8fe6cac3c5705c6a9f210a210cc07aa5' 
  AND token = '9EjRVYdNKQgr8hZ+/VT76DI3BY3Ivr2PqSyJXPxP7d4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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