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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36541cde4c883d5e9309911cf9d7f9225e5350a54bc4d90206cd641f48368e43' 
  AND token = 'FU2shRrYB5QjVdIYONmFT03ogqINgpBokU7j38/6cjU=' 
  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"
    }
  }
}