SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbcd727e60ba2654579858ddb1f633f8ba2df24e15266a91e722c840d4b98688' 
  AND token = 'LXkR4/LhovVuMDTWlxTvYk4Mk/FqiyX+8zzhr1pm61Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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