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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3778cb2c4ed5ce1d0cbf59881e5ad0f60f9d917ce7d66fd82b8d96332321a10f' 
  AND token = 'ykulund2PTzHnQVjch6xWNRa8YBlW9d15jWoNiBRr+M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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