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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2dc715ee087457440682ab014b37ec81fd208b779b6be2e36117ae3d36fcd245' 
  AND token = 'mF/F2v8KE/bygxnNrw7U01sXET+X/ZXSDk+0T0i851A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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