Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '552af201ab6b13bfe6c06b4429ac81649fa479907a1e941ac52e7526a283b4fb' 
  AND token = 'B5otdK5AZ2yNewl7dfzwA8psKFCHUuT4cpCH4UCtbyE=' 
  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"
    }
  }
}