Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f93f724aaf41592ffa8956c9ee176014c8dfffd7a07a126085c56f797c9ea06' 
  AND token = '3tT2tBm1PGmWchUysfwZzuK5K6+YXffjHiJ3roEPDik=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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