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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be3dc269e2e18ec996ac858823407aa9cd24b5ab3fbe967bd8ff8d6a96638e6f' 
  AND token = 'yPBgTaWqGoGRg0pdavgHI/sopvSDov4tYv0zHgov4lM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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