SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0637884618941154f7b3d7a018b033fe9af7937cd6aa7fd6b274ed7486440af5' 
  AND token = 'QrFwK6jvFit0KbFzgKgKXs02Pq4X6R/ZBGycsPRbNAY=' 
  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"
    }
  }
}