Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88d59c3a10a7f48a52ab93620803adc4678f86bafaba32c2366bce2f0299310e' 
  AND token = '4M6U4dPu5NaSmNQ7b2JoJyaqzBORUJrcaBTbRk2ExNo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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