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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97ca9582eeca8f64158c82560d2a9278005319fe60999a16fa9c22367fb17a36' 
  AND token = 'tF5XGUljqW2BUYLBX1SvI9g6mnlLwLIu0vynLsNvUnU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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