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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '792a5c202ebe26f437c079f6b30cb90899148ac197a3843ad4d2680cc65d10d8' 
  AND token = 'xrx32di3Ctk6B5Q1ekQIUMDzb8p2/D0BoWXrgvolbvU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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