Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab0e55318220d49546dd738741e8b65e42eeb610d6ef5150fe26fb9072673096' 
  AND token = 'eLk9drlzNNX+b7z5EhRimvzOe4YLqSNnRptVyvHCJ3Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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