Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e412c54d42eca7ba4e591cbaec27a5433e96c4735be4ac444ec98078d4cde6db' 
  AND token = 'tpi7hJHvQqd6J4dueNxITEVqedh8rNzKFNvKiKaAyGw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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