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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5ddcb0ee814ae4b780f9561bf09d95fbf7bf50a7c5d9d97939332d9f773d3eb' 
  AND token = '14iqHB8+wYoEHJGoKtbgwghJCvn3El4T5cAbMs48bRI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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