Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c92dbfc48a72c752dde120c34339a5fa2aa7e3916d4a393bcbf628516c1bf07b' 
  AND token = 'i4mxvuEBxss8UB6ZEYcOfGtibvTpkgCIgOwiCfOgkXo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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