Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c77bc502302bfd08859a405403472e2d3e4d3e0f64a075ed212c50aaf4ec930' 
  AND token = '+O+B2QHaKd27P4ITM+YHaW0Q+Ys3zwb+nYVYAGAfUnk=' 
  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"
    }
  }
}