SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72f31aa0b71a6911b697a1f180f0cebf205980eafe585b47cb250f4ca735b335' 
  AND token = 'yMZzHJGL4QXK6R5Bo9Tzj1KGj7rqgCs8m5v8WrqyK4g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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