Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a273afc4ae2a0e84a06e7da67a138c5c104d3b5cd052c6f5cefbc6a1a7225b4' 
  AND token = 'KKRKpkC/8D5hapt7SHdEoyxsMW9IRjB0T8GJx8MJ7PA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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