SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0db83c5e0511c1d22c1f8209ccd079b3f48d52a043e446ed736325646677525' 
  AND token = 'LtUMsmJKJU14hfgph/79KopBB9yV3yKRcZITHuavrT8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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