Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5577866fe74529aad081f6a7c7358fc3bca689096e4bc776e84deb4308b1eb43' 
  AND token = 'A67jhEMJ3dlV0q6v6WQNUGOZm728b7GWcvRU0s+2NRY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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