Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a49be0fdcd73415fc92c0294bb0f92970e4b17dc42d7d8500c3d39971547c7e9' 
  AND token = 'PgY1Po98qEkJ9KSPBLkPibOEoIQjggJG3tQJBBhnUNU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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