SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5de888122fdbc8a4951bd3064bafa38f87ea67fd6e27162642d930b9526f27fa' 
  AND token = 'Aup7mAzXUz0v4Dx7x7HoYUS+isnG78M61XmtJZShVlE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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