Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb1524adeb00fdbd44de70a2f32881219345a1f530d8e9f1eae35cdce651c308' 
  AND token = 'OVCON4b9Kt3yKbbmYrSfjSDaCJqk2RLfuSZsYXsa95o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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