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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23d8bedca1efcaf6f6a3f7754c4316170a61f7ec92dfefe1270916fe09a7b66b' 
  AND token = 'JmJUmwO/S679gA6ReD3w7BofR/Z+BjVpSKX6EXiyx6I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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