Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bac3bf0ddb611debb469224a485f78457be78e725d3ace3739549a4c4c6e2926' 
  AND token = 'K0zdofT8g9usGJPaQbl58c4n9ABYZ2WqfKeWvliEHxM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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