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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7e8d4e17c7ef842d2875134b75ac4a4aeee85e4caac8aefc970fdc58abccce2' 
  AND token = 'up7eGmIMVK5eVzJ1WxrfbXkO7QSFF016+HRT6tSsHUk=' 
  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"
    }
  }
}