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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c92e80bba3574398297288dd3a0147c86165bac7031cec1ed304e9f7bcd5491f' 
  AND token = 'Rdjzw2yiW2E4rmqSiaDvonpx9tqmCps0mf9upT6mqSA=' 
  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"
    }
  }
}