Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f656b4dd1925f2f0a6e3cb035fd99ca821ddb42e003bc6b409bd5ae0078ba712' 
  AND token = 'iVA4pGZyGjx8Fiae3Q4wcpimpMrBZs5x77kCeASSpXY=' 
  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"
    }
  }
}