Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1adc129b1b7612c907faaf9f1d6f4d9c55912ece4187084d015c195f4b033b6' 
  AND token = 'zv/j9tVP5ntfTonutnRL+XsbEu7WUIOzNZHt5jr/EWQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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