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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d1df6ef3522c5117a911381bf2dcb83aaa7b355eb906cc35bb4ecdc87c03193' 
  AND token = '1gkMHbcQd6h9/yg8d1AKiHbOiQ2eOO0w77eD8A1OqFM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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