Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '914888ff71d7200240847cfbc534b4f993f6b1df51fe8d6a8e395922108bf51d' 
  AND token = '82nCNbXTXfi1HZL+8eLjcKyfyH/UcQnE04/APyk6vGg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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