Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fdd82e59bf342c977914832b64720cb9b340890fbc05d195ff2d56778db764a' 
  AND token = '7+NGshYoocODfOkuMHy5DvLuvg+hNc43w3Atn9ZQXyI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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