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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '974f17a26bfd4cd9e48cde8a765cfa87a884f55ee167682ac7dd1d3283e32232' 
  AND token = 'Igz3cB6z+ACcUoJ3W/DEQJ4QGGWGoxSo9LV2j6Ddqjs=' 
  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"
    }
  }
}