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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16acb51cc1824d51a5bf9a08590a583b0297d2d375cffe0372b05a220e8d4356' 
  AND token = 'NVnn9P6sR3SNc0JZVoY04g0WOPsvkn4QCjgfTX78e/I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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