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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23a6754c4fadb6839f1a7de8c97acb75fe9f7780ee1df0ec7426726dfaeb3976' 
  AND token = '+RFOxarp01z5OepTkKRe9wya+moFVc8bY4LwbgWK3as=' 
  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"
    }
  }
}