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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85f9e71a368bfe3103f9c39625e94141ac8413c24efe3e1d7b012591a6964d03' 
  AND token = 'PQrVCZQw2G+bYchnJeWU25brhxwP9xr+DdGkMrQ9SJg=' 
  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"
    }
  }
}