SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3fdd806372e9f7095a59fdfe8f8a2497b560174136700afb0cb655de02b7dc1' 
  AND token = 'CVCoCbQgGV+MYJIZpfsZKKVEYa23gw7wl9B/inESKns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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