SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8382a3fdaeb60a14d12159959b3daec817324fbcf891ab61a3e93150ba0682e2' 
  AND token = 'S3qki5opL8Yg/su8v1QZB35kRItKJlNQM6mzVKkzGj0=' 
  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"
    }
  }
}