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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14522f815c4b5ab797459345e79725b4603ed17a73624f1b05c05c510116dc3d' 
  AND token = '911bgxao0PnStAzt5tyFabh6QWRNjUdqwWS2LGdAav0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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