SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ae0ab4ee88319016c17da225e6854fed0cbfafa8a292208c1f4f3b3cd16c1b2' 
  AND token = 'zH/5uDv9yVRlmJIGS2hNiOtwOM+SYvS6gC1cdO7GrZg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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