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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '817307c40ec1ecdc21dadfbf949628dcd158d4ca140f49c268fc23e22b5db79b' 
  AND token = 'ZDMrDw49lbM6Pv/JE9QzNrIIK+XXVeB6zcnBsufOQvU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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