Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '197f007251c7148a21a1606821223cf158210542807fd1df06827fab3e79a25a' 
  AND token = 'iqdyIME6fOT6CkVU+1njBwwx4fZwGBXapetiGssK0ic=' 
  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"
    }
  }
}