Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3103c267be16ffc5805d83af8813591300608d9b555cf7c413f099ebbd62e2b' 
  AND token = 'yEuul3XgRPcqKeKKkox8AsGBUC39yLOzsdr/TN86XKk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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