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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91b75e2e1736fe6cb10e07b624361ac5dba1ed03aea90553ddce89da15c3d052' 
  AND token = 'r2Y1FwjPoOxRmYAvnCTxAY5WWwsQr2dPI1ZOu0Aom6Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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