Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce5db71f03c80618fbae982ea952d9a35bec5b6cfc5c787058bfc46c44140958' 
  AND token = 'IRQJYT89gwBeJ7baQTg1X6zbNOdDS6aW/yoagc/y4wQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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