Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17668b3e5b7b0b02effcf8c4865f8e6962e775aa4080f5eb3b9aac5a78a4f359' 
  AND token = 'jCiET+YKFkGjU5jykSVjYZGCzrTkKGje5T5kEHH6tWM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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