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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1794c593edfcb6bd833091f50c5e26e8f9c61eb1f89f8fb89ac5d5655fe21d29' 
  AND token = '2BLXREby5fIqyuxG0wtnO29c3vR7jpzDVDf3ifr2IOU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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