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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'acedd8ae72e3a7f938c82265589346d4feea276ac296c54ddb3738d859863d0f' 
  AND token = '26DiSplWz538DndYKCqcAKULtijJ/NsXsKTbG3qGTxU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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