SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ca93e647cb5170da80aab2ede6579438f5b85f107c93896f2fc1d9bbd19798e' 
  AND token = 'zOjmqTljaJ8uC6q5nHqeih3TrrFHct86P9KXPGSBJUI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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