Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e23fe200b2bf8dfcbb94b84da383cf60990d48af7410b051c8fe521f3089df89' 
  AND token = 'K9Fzxgidg1eAyubifbpbKJqROXrb7tNadwTo8C2o7f8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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