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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd34c70c83a6b56da3b9815cbf03c9eb585dc612da48166a1b837a8d8e88e8e4' 
  AND token = 'ueNYvge+9uiEJnnuDHyEkXJJZ73RSssqjg86PbWXhEA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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